Machine tool



May 26, l936- R. E. w. HARRISON ET A1. 2,042,257

MACHINE TOOL Filed June 30, 1931 5 Sheets-Sheet l iig J inllm'l'illnnn..

MINIMUM" lIHIIHx'I llmlmhnn @E INWHHHH" lllln lllillhllll 33W mi May 26,v 1936.

R. E. W. HARRISON ET AL MACHINE TOOL Filed June 30, 1931 5 sheets-Sheet 2" S11/vento@ w w m. M w W2 i www v f l May 26, 1936. R. E. w HARRISON ET Al. 2,@29257 MACHINE TOOL v y Filed June 50, 19261 5 Sheets-Sheet 3 gyn/vento@ AAAAA A www May 26, 1936. R. E. w. HARRISON ET AL 2,042,257

MACHINE TOOL f .Filed June 50, 1931 5 Sheets-Sheet 4 NS O/f ff wlhmm 76%, Q0 /254 May 26, 1935- R. E. w. HARRlsoN ET AL 2,042,257

MACHINE TOOL 5 Sheets-Sheet 5 Filed June 30, 1931 M ZW f, f ma www.

Patented May 26, 1936 UNrTED' STATES- mm1-eenen Cincinnati,

.Grinders Incorpora poration of Ohio 'fuscnms 'rooLf bert nfw. nennen-eno eeen w. Hopkins,

assignors to ted, Cincinnati, Ohio, acor-V l cinnaii This invention relates to improvements in machine tools and especially to improvements in meansforcontr'olling and effecting the feeding of a tool and the work.

An object of the invention is the provision of improved means-for feeding the tool and workrelative 'to one another to compensate for wear of the tool as determined by the size of successive` work pieces. f

Another object of the invention isy the provision of improved means disassociated and remote from a machine tool for controlling the relative feedY between a work piece to befoperated upon and the tool. f f

A further object of the invention is the provision of an improved amplifying gage mechanism for detecting oversize work pieces and for eifect ing an adjustment of the parts ofy a'machine tool` organization to correct for said error in the work.

A stil-1 further object ofthe invention is the provision of improved means for selecting pre`" determined work pieces to be gaged orfinspected so that periodical adjustment of tool and work may be made to maintain the proper relation between ther'n and insure successive work ypieces ing tooled vto the desired size. f l

Other objects 'and' advantages of ence tothe following specification considered in' conjunction with' the accompanying drawings' and it is to be understood that any modifications may be made inthe exact structuraly detailsthere shown and described, within the scope' of ythe appended claims, without departing from' or ex-Aj' ceeding the spirit of the invention. In the drawings:

Figure 1 is a top plan view of a machine embodyins l Therchas beenchosen and depicted/in the drawings for illustrative purposes the centerless grinderwith which-the inspection :and control-` ling mechanism is employed but itis tobeunderstood that this structure .may be used with'any v r other machine tool requiringja i tween the tool and work.-

and a. gaging and feeding mechanism the principles of this invention.

Figure 42 is a sectional -view'takenfon line 2--2 of Figure l and showing in detail the timing inecli-V anism forming a detail of the invention. s Figure 3 is aside elevational view of mechanism as seen from line 3 4 of Figure Figure 4 is a diagrammatic illustration ofthe,4 light ray utilized when the. work is beyond a certain definite size.

Figure 5.is a wiring diagram of theelectrical circuit operated by the light IS7 shown in Fig# ure 4.

Figure 6 is a sectional view taken online of Figure 1. 4 l Figure '7 is a sectional view taken on line I--l of Figure 6. i

y vthe present invention should be readily apparent by refer" of Figure 6.

Figure 9 is a semiediasrammaticel View from a plane above "abattery of machine tools,` each discharging finished work pieces to 'acommon inspector'whojhas control of the said battery of machines. 'f

Y Figure A1o is a seetionnrviewitaken: on Ill-lll of Figure 7.

Y Throughout the ployed to denote the same orsimilar parts.

several views of the the same or similar referencecharact'e'rsfare ein- 1n `the past, it has beencustomary to periodically manually gageo'r' the work Iby thevv machine operator to determine Aits size and,V theA functioning of the machine; 'Ithiis'also beeniproposedto mountvari'ous 'electrical-and mechanical in an attemptt'o compensateA for variationsin the Asize ofthe work. In the former method ofmanual inspection'- and size determination the operator frequently passedwork not of the `highest 'caliber or within predetermined definite sizes-resulting in diiilculty inthe subsequent. assembly or f the parts. l In the latter type of sizing structures 1 mounted directly onthe machinegchips removed from the work and inlthecaser of grinding niachines the grinding coolantand 'the human ele-" I :$2 ym'ent entered to defeat the *designed purpose thereof thereby resulting in. work pieces that vrequired further machining operationstherecfn having the work conveyed'to him for .periodical inspectionand check up on theultimate position*v of the several parts, all as will be `made Yclear evident in the following specification.

Generally the invention comprisesa tool having a base or bed'll supporting for opf eration thereon a work piece] and for present-- ing said work piece to .a suitableftool or cutter.`

ysuch-:isiliegrinding wheel l2.. The work passes w from the tool toa conveying mechanism. here l shown as atrough l), for conveyance to themspection station which includes abenclror M Haunted 0n the. table Mil themlnsmwh- II sizing mechanisms directly on' themachine tools Y anism Il which, through suitable couplings and connections, operates an electrical circuit enclosed within the casing I0 which effects the operation of the feeding mechanism, as shown at Il, for feeding the work and tool relative to one another. From this it will be noted that the machine is at all times within the control of a skilled work inspector who can very minutely determine the size of the work piece and automatically make the necessary and proper adjustments of the machine tool parts which adjustments and the size of the work piece are in nowise affected by coolant chips or any other extraneous parts of the machine tool organization.

As was noted above, the machine illustrated in the drawings is a centerless grinder and the invention will now be described with reference speciflcaliy to vthat type of machine butthe claims are not to be restricted in their scope except as specifically restricted.

A centerless grinder includes the bed or base il on which is rotatably mounted the grinding wheel I! for operation on the work piece Il supported on a work rest blade Il mounted on the' forward end of a slide Il supportedby the bed Iii. Opposed to the grinding wheel I2 andengaging the work at a point substantially diametrically opposite to that engaged by the grinding wheel I! is a regulating wheel 2l rotatably Journaled in a bearing supported by a slide 2i superimposed upon the slide il'. rThe two wheels i2 and 2l are spaced from one another a distance representing the exact size of the work and the work 'I I is then passed through this grinding throat to reduce it to the ultimate or desired size. As is well-known, considerable wear and frequent truings comparatively lrapidly reduce the diameter of the grinding wheel thereby destroying the size of the grinding throat. To compensate for this wear the slides i! and 20 are adapted to be advanced relative to the bed Il toward the grinde is provided an adjusting screw 2i having one endy ing wheel thereby to adjust the partsto the original set-up. For this purpose. see Figure 8, there journaled Vin a bearing 23 extending upwardly from the bed, see Figure l. The adjusting screw l2 is'threadedly received` in a rotatable nut 24 journaled in the rear wall of the regulatingwheel support 2l. Collars f2! and 21 prevent endwise movement ofthe nut but permit rotationy thereof. Secured to the screw 22 exteriorlyV of the bracket 23 is a pilot or hand wheel 2l .whereby the said screw may be adjusted for initially orvmanually adjusting the parts. The parts are automatically adjusted.V as will later appear. through a worm 2s and a -wonn .wheel Il. the latter being keyed to the nut Il while the .foi-mer is hydraulically actuated. j

` With the grinding throat conditioned as above described, the work IlV is passed `therethrough into the conveyor ortrough Il for conveyance to the inspection station. As is lwell-known the wear on'the grinding wheel? resulting from its operation upon a comparatively small part is not suiflcient tofdamage. or change the throat size.

therefore, only periodical inspection of the work takes place. To this end a suitable trip mechanism is provided at the end of the conveyor or trough Il for selecting automatically the desired work pieces to be gaged. :A pocket or chute jl is provided at the end of the trough il into `which the work pieces'discharge from the said `trough or conveyor il being intercepted by a baille plate l 32 and directed against a trigger n. The trigger 83 is provided at the end of an actuator arm 3l pivoted intermediate its ends, as at Il, and having pivoted to its other end a pawi Il which cooperates with a ratchet l1 fast on a shaft 3l. A spring 3l yieldingly returns the actuator arm Il to its initial position and a second spring 40 s yieldingly maintains contact between the pawl 38 and the ratchet Il. A stop latch 4I prevents the rotation of the ratchet I1 'except vin one direction.

Secured tothe shaft on opposite sides of the l0 ratchet 31 are a pair of cams 42 and 4l. The cam 42 is substantially circular in cross section. being provided at one point in its periphery with a notch u to permit the end l5 of latch 46 t0 drop thereinto when in alignment; The latch It l5 is pivoted at 41 and is actuated in a clockwise direction about this pivot by the spring 40 which movement is limited by engagement .of the end It with the periphery of cam I2. The free end of the latch 6I has secured thereto a pivoted dog 4l engaging the rear face ofthe collar-or shoul.

.by the wall of the housing Il enclosing the trip mechanism. The section Il ofthe telescoplng shaft is likewise slidable through a bearing carried by the wall of the housing BI. 'Ihe shaft 52a has a collarror shoulder It against which abuts one end of a spring BI which, in turn, abuts on its other end with the collarpor wshoulder Bl of the shaft li. 'Ihe shaft Ila extends beyond the bearing 53 into engagement with the periphery of the cam Il which, it will be noted, has a very low point 5l from which its periphery effects a rapid rise Il tothe high point Il.`

The rate of rotation of the shaft Il and cams I2y and will depend entirely oiiy the Anumber of teeth in the ratchet Il wherefor a coarse tooth 40 ratchet willrapidly advance the parts while a tine tooth ratchet will advancek the parts ata -A substantially slower rate.

The operation of thetrip mechanism is as follows: eachwork piece as it passes oif the end of 45.'

the trough Il is deflected by the platey 32 into en gagement with the'trigger $3 oscillating the arm il about its` Pivot and advancing the shaft Il j through an arc equal to the distance between successive teeth. In other words,` if it is de- .50.. rvsired tovinspect and gage every flftietn piece a lofthecamandtheendortailIlofthelatch ll would engage the cam 42 at a point beyond oo the notch u, Rotation of the shaft Il' ywould carry with it the cams wherebyv cam would gradually shift the shaft portion 52a through'its bearing 73 compressing the spring betweenitself and the shaft portiony Il which is 'held against movement by the dog 4I, on the latch It. "This a5 continues until the spring Il is compresseds'ub-4 stantially to its limit at which time the tail 4l of the latch 4B is aligned with the notch M whereupon spring actuates said latch in a clockwise Y direction about me pivot 41 releasing the eeuu 7 or shoulder." from the innuence of the dog 4s permitting the spring l1 to expand and i'ire. 'I'his causes a forward shifting of the shaft portion 5i which 'carries atits forward end a roller Il enming s mp door n which u immediately below 7" 2,042,251 the chute al and actuaires said aber to the autres` line position shown in Figure 2 `so that the next work piece descending through the chute 8| is shunted on to the top of the table i4. f lOtherwise the work pieces falling through the lcasing 3| pass through the passage 83o betweenv the casing 54 andthe table I4 to a suitable receptacle, not shown. The next work piece descendingv through the trough or conveyor i8'would engage the trigger88 for advancing the ratchet 81 an.

additional tooth thereby advancing the highl point 68 of the cam vbeyond the end of the telescoping shaft section 52. l'Jifileweight of the door 82 would immediately-shift the telescoping' shaft sections" 5| and 52 tothe left, as seen in Figure 2; so that the end of the shaft 52 engages the low point 58 with the collar 58 behind the dog 48.4 .l

'I'he inspector or operator then places thev work f `piece on the gaging mechanismftordeterminer-its1 size. 'I'his mechanism 1 comprises a base 88 to which the anvil or gage block 6411s secured. The block 84 is' provided with lan anvil 85a andfa vertical wall or abutment 86 on which the work lies in contact with the gaging portion 61 of an arm 88 `pivoted at A69 between lugs' or the like "i8 formed integral with or secured'to the block 84.A

An adjusting screw 1| is provided inthe arm 88- intermediate the pivot 88 and gaging-portion 61 and contacts with an upper surface of the block 84 to hold the arm 88 in rits normal position. It will be noted that the pivot 69 of the arm 88 is considerably closer to the gaging end 61 than tov the free end of the arm whereby a large amplification is obtained at the free end of the arm 88. This free endof the arm 88'has a' pin 12 secured therein received in an elongated slot A18 formed in the end of armV 14 of bellcrank 15. The bell crank 15 in turn, is pivoted at 18 to a bracket 18 secured 'to the base 88 of the gaging mechanism i5. The other arm 19 of the bell crank 15 has a pin and slot connection as at 88 with arlink 8| having at its opposite end a pivotal connection 82 with a mirror 88 pivoted at 84 to a bracket 85 formed interiorly of light beam casing 88. A spring 81 is mounted between the mirror 88 'and casing 86 tending to return andfhold the parts in their normal position and ymaintain contact between the `end of the adjusting screw 1| and gage block 84.

The relation between the under or contactingr face of the `gage portion 81 oi the arm 88 and the inclined surface 65 of theanvil block 65a`and the vertical wall orabutment SSlfrepresents the exact size of the work, this relation being maintained by the adjustable stop screw `1|.` Therefore, it will be noted should Aa work piece be over-` size it will oscillate the arm 68'about its pivoti-88 and thereby actuate the bell crank15 and mirro r 88. This oscillation of the mirror` 88 causes a' swinging of a light beam directed from'a suitable H source onto the said mirror 88.

In order that the gagingmechanism may be adjusted to various diameters the `block 84 is provided in its forward face with .a guiderib 84a received in `a. corresponding guideway formed inthe anvil 65a.4 The anvil 85a has formed at its upper end the'inclined surface 85 on which the work rests. An ear or lug 63a extends from the base 83 and has journaled therein the adjusting screw 83h which has a threaded'connection with the anvil 65a and whereby the said anvil is raised or lowered relative to the block |4.l

The light beam amplication -mechanism, as

shown inFigure 4, includes a source of light 88 within'the casing 88 located at one side of the pear.

- 88 has feed lines 88 and |88 extending therefrom the other side thereof. `current from` the coil |i8 through a line ii4, solehousing 88 which a beamof light to the mirror 88,..A This beam of light with the mirror in the solid line position in Figure 4 isr reflected `baci: to the source of light, as indicated by the -arrowed'line 88, while-a shiftingof the said mir- 5 ror, due tothe oversize of the work piece, will causesaid beam of lightfto move'throughan-arc i, to the position indicated in Figure 4 by the arrowed line 88a.,l As there shownV thebeam'f 88 upon strikingthe-mirror- 88 is deected inthev path'indicated as 88a to `a Vsecond mirror'si fromy which the beam extends as: 8|z:to a third mirror 82 from which-thebeam 82a". travels to a nfourthmirror 88 throughthe path 88a to a light l Viii sensitive cell84, known. commercially as Va. photoelectric cell. `".ihis cella84 is in the. nature of a tube andacts as a switch forcompleting an elec-,r I

trical circuit to effect an additional-.movement between the tool and worlr'to produce successive work pieces to the desired?l as' will later ap The photoelectric cell 84 isi shown diagram--` vmatically in Figure 5 which .diagrammatically illustrates the electrical circuit controlled and operated thereby.` This circuit includesa suitable transformer 88 vcoupled witha source` of current or main power lines' 88- and 81 for feeding current of the desired voltage tothe vseveral electrical instrumentalities there employed. The coil and terminates in 'a potentiometer '|8iwhich,

through line |82 extending from the potentiom-f.

' intermediate portion of the coil ii8 is connected@5 l' by a line `i i1 to one elementi i8of the photoelectric cell 94 while the second elementi i8 'thereof is connected .by a line |28 .to thep,otentiometer grid line |82.` The solenoidi has extending therethrough a core |2| `secured to bell crank 59 |22 pivoted at |28 for operating switch blade |24. Y This switch blade |24 is employed for completing an electrical circuit including the conductor |25 from the mainline 88 through a conductor |28 to the secondmam une l1. 'rms conductora: hasf vincluded thereon the solenoid |21. A core.|28

associated with the solenoid |21 is employed for 'operating switch blade |28 about its pivot |88 to complete a second shunt 'circuit extending from theline |28 through conduit i8|l and a second conduit |82 extending from .conduit |25.

The operation of this part of the mechanism 'is as muows. with the gage barn m its normalY position the light fromits 4source 88 is directed back upon itself. Also, the electrical potentiome- 55 ter onthe grid |88 of the vacuunitube |84 will prevent laffiow of current therethrough since the photo-electric cell will 'onlyr ycomplete'the 'cirf cuit when s,V beam of lightv is directed thereon.

As the work piece is mounted on the gage block 7 0 the arm 88 is oscillated in a counter clockwise'j' direction thereby shifting the mirror 88 to the dotted line position shown in 'Figure 4 where-- l upon thebeam of light through theseveral mir- Y terminate on the'cell 84 75V rors there shown will completing the electrical circuit between the elements ||2 and ii2 causing afficw of current through the lines Iil and ||2 forplacing a positive charge-of current on the grid |22 thereby nullifying therblocking vaction ofthe negative potential whereupon a `iiow of current is established between the plate |22 and the mament |22 causing a flowof current through thev lines ||2 and ||2 andthe solenoid ||2.` Thisenergisation of the solenoid iilloperatesthebell crank |22V about its pivot |22 `thereby operating switch blade |22 and completing the electrical shunt circuit |22 and |22k which energiaes the solenoid |21 in the line |22. The energization of the solenoid |21 eii'ects the operationof the switch blade v|22 for completing the second shunt circuit through lines |2| and |22 to energile the solenoid|22insaidcircuit;.r.

Theproportion ofthepartsissuch thatatenth of a thousandth of an inch on the work il will, through the large ampliilcation in the arm 22,

eii'ect a relativelyv wide deilectionof the mirror.

22andawidesweepofthebeamof light atthe outerendthereoftobringtheendoisaidbeam oflightintoresistl'! withtheopeningo tothe light sensitive cell 22. However. it will be necessary thatthebeamoflightbe directed ontothe cell 22 Land therefore, if the' work piece is less than the tolerance allowed. here comidered as atenthofan inch.theinfeedoradiustment of the tool Vand work will not be On the other hand, if the sise of the workpiece is more than the tolerance, the passing ofthe light beam across the opening 22a wiil'be sumcient to compensate for the diiference in the sine of the work and will operate the automatic in-feed mecha- 'Ihe solenoid- |22 hasa core |22 coupled with a valve stem |22; The valve proper |22 on the 40 stem has a plurality of grooves indicated respectively at |21, |22 and |22 and provided with suitable intermediate cylindrical portions having a sliding fit in thevalve-iiushing` |22 mounted in thecasing |2| can-iedbythebracket |22. 'lhis bushing has the ports |22. |22, |22, |22 and |21 for coupling a hydraulic medium under pressure with oppositel ends ofthe in-feed mechanism. Port |22 is alignedwith'iniet |22 for the oil or hydraulic actuating medium under pressure while ports |22 and |21Vare coupled with passage |22 from which'extends the exhaust or discharge conduit |22.

When the solenoid'is ele-energized spring |22 "shifts the valve to the position shown in Figure '1. The flow of the actuating medium` is then from the suppl! Pipe |22 through the port |22, groove |22. port |22 andjpassage |21 to the left hand end of cylinder |22 urging thev piston |22 therein to the right and oscillating a disc |22 and pawi |2| carried thereby to an inopera-I tive or retracted position. The disc|22is rotatably supported by a bushing |22 and has a segmental or circumferential rack portion |22V adapted to mesh with a rack |22 on the piston |22. `The pawl |2| is pivoted as at |22 intermediate its ends to the disc i 22 having one end adapted fory engagement with the teeth of a ratchet |22 as thediscandpawlaremovedinaelockwiaedi, rection and having the opposite end pressed downward in such engaging relation by a spring |21. The ratchet |22 is keyed to a shaft I22a integral with or having secured thereto the worm 22 whereby said wormand partsconnected therewith are operated.l This end is additionally beveled for mement withan adjustable kick yout screw |22 carried'bythebracket i22.- 1

When the cylinder |22 is actuated to the right, as above described. and as seen in Figure '1. the liquid contained in the right hand end of the cylinder is exhausted throuxh ka ypassage |22, port to the discharge conduit |22.

When the electric control circuitis completed the solenoid isenergized and reversely shifts the valve member. In this event they inlet of iluid is fromconduit |22, ports |22 and |22, es

Ill and III to the right hand end of the cylinder |12, groove |22 and port |21 and the passage .|22 I shifting the piston overy on its feeding stroke i :which is shown as Just oompleted'inFlgure 8.

In this instance the exhaust is through passages |21 and |22, ports|22 and |22 to the passage |22;V

f and exhaust conduit |22.

Return of themirror22 to its normal position.

shifts the beam of light of the `photoelectric cell thereby breaking the electrical circuit therethrough allowing a negative potential to beplaced on the grid |22r and interrupting the now through the circuit containing the solenoid i Il whereupon theswitch arm |22 interrupts the shunt circuit and de-energizes the solenoid |22. at which time the spring |22 shifts the valveas above-described, for re-setting the parts for a subsequent feeding movement.

From the foregoing description the construction and operation of the present improved mechanism for preventing the production of oversize work pieces should be readily understood and it will be noted that the work may be automatically passed in a continuous stream through. the Vgrinding throat. As so passed work pieces in excess of the predetermined size will effect a shifting of the mirror 22 and complete the electrical cir- ',cuit through the photoelectric cell 22 and eect a compensation between the work and tool.

Figure 9v illustrates the application of thevin-v vention to a multiplicity orbattery of machine tools. eachl delivering the work pieces to a common station whereby a single inspector or operator maycontrol the batteryA of machines at a point remote therefrom and insure the proper size and iinish on the work.'

.n wm runner benoten that mesme meter-` mlning mechanism in question is readily utilizable for imparting feeding movement to any machine in which the completed work pieces after discharged from the machine may be causedto pass successively in engagement with the work contacting feeler and will serve to effect proper adjustment of the work support vand ytool one' relative to the other irrespective of whetherk the adjustment be of the tool or of the work support and that in either event accurate sise maintenance and prevention of production of oversize work pieces due to the wear of the grinding wheel or other cutting tool is most satisfactorily effected. l y `Whatis claimed is: u

1.*In a machine tool organization the combination of a machine tool including a support for a work piece. a tool for-operation on the ywork piece, means for effecting l'elaizive feeding movement between the work and tool, means disassociated from the machine tool for operating the feeding means including an amplifying gage, and means conveyingthewkfromthemachine tool to the gage.

2. In a mesme tool organization thseombinstion of a work support. a means for eifecting a relative feeding movement between the work and tool, and light operated means operable by an oversized work piece for energizing the feeding means.

3. In a machine tool organization the combination of a work support, a tool, means for effecting a relative feeding movement between the work support and tool, means operable by an oversized work piece for operating the feeding means including an amplifying lever, a mirror operatively connected with the lever, a light source, and means intercepting the light source and operatively connected with the feeding means.

4. A gaging and' feeding mechanism for use in a machine tool organization'` for effecting a relative feed between the work and a tool comprising an hydraulic pressure source for the feeding mechanism, a valve controlling the pressure source, electro-magneticr means for shifting the valve, an amplifying gage arm for contact with the work, and an' electric circuit including alight sensitive member completable by an oversized work piece in cooperation with the amplifying gage arm.

5. In a feeding mechanism operated by an oversized work piece the combination with a work support, a tool, and means effecting a. relative feed between the work and tool, of electromagnetic means for operating the feeding mechansm, an electric circuit therefor, a light source, and a light sensitive cell in the electrical circuit for completing same upon direction of the light source thereto by an oversized work piece.

6. A control mechanism for controlling the feeding movement between a work piece and a tool comprising means for effecting said feeding movement including a hydraulic pressure source, a valve for controlling the pressure source, electromagnetic means for operating the valve, an electrical circuit for the electromagnetic means, means preventing a ilow of current through the circuit, and means operated by an oversized work piece for nullifying the blocking means and effecting an operation of the feeding mechanism. v 7. A control mechanism for controlling the feeding movement between a work,I piece and a tool comprising means for effecting said feeding movement including a hydraulic pressure source, a valve for controlling the/pressure source, electromagnetic means for operating the valve, an electrical circuit for fthe electromagnetic means, means preventing a flow of current through the circuit, means operated by an oversized work piece for nullifying the blocking means and effecting an operation of thefeeding mechanism, said means including a light sensitive cell, a light source,l and means operated by the oversized work piece for directing the light source onto the light sensitive cell.

8. In a control device for a feeding mechanism the combination of an amplifying sage, a light source, light operated means, feeding controlled by the light operated means, an electrical circuit for the feeding including the light operated means and means between the light source and light operated means ad- 5 justable by the work through the amplifying me for closing the electrical circuit and'operating the feeding means.

9. Inafeed control mechanism the combination of an amplifying gage. a feeding mechanism, an 10 electrical circuit for the feeding mechanism, light sensitive means in the circuit forA completing same, a series ofmirrors including an adjustable mirror operable by the amplifying gage for directing the light source to the light sensitive means and 15 completing the electrical circuit.

10. In a device ofthe class described the combination of a feeding mechanism, an electrical circuit for operating the feeding mechanism, a shunt electrical circuit for controlling the main 20 circuit and including a switch therein, a solenoid for operating the switch, an electrical valve in the circuit for normally preventing a flow through the circuit by placing a negative electrical potential thereon, a light sensitivefmeans in the 25 circuit for nullifying the electrical potential on the valve. and means for directing a beam of light on the light sensitive means. f

11. In a device of the class'described the combination of a feeding mechanism. an electrical 3o circuit for operating the feeding mechanism. a shunt electrical circuit for controlling the main circuit and including a switch therein, a solenoid for operating the switch, an electrical valve in the circuit for normally preventing `a flow .through the electrical circuit by placing a negative electrical potential thereon, a light sensitive means in the circuit for nullifying the electrical poten-` tial on the valve, means for directing a beam 1 of light on the light sensitive means, said means 40 includingv an amplifying gage, and adjustable mirror operable thereby, a light source, and a series of mirrorsbetween the adjustable mirror and light sensitive means. Y

12. In a gaging and feeding control mech- 45 anism thecomblnation of a frame, a mechanical arm pivoted on the frame having a relatively large amplification on opposite sides of the pivot, an adjustable anvil cooperating with the short y end of the arm and spaced therefrom a distance 5o equal to the proper size of the work, a feeding mechanism, an electrical circuit for the mechanlsm, light sensitive means for completing the electrical circuit and operating the feeding means, and means on the yother end of the amplifyin arm operable by an oversize work piece on the anvil for controlling the lisht'means.

aonnn'r n. w. miamsorr. man. w. norms. 

